mirror of
https://github.com/golang/go
synced 2024-11-24 16:40:15 -07:00
5c6db9a76f
First letter of an error string should not be capitalized, as prescribed in the [wiki](https://github.com/golang/go/wiki/Errors).
Change-Id: Iea1413f19b5240d3bef79f216094d210b54bdb62
GitHub-Last-Rev: d8e1671071
GitHub-Pull-Request: golang/go#35203
Reviewed-on: https://go-review.googlesource.com/c/go/+/203797
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
104 lines
2.2 KiB
Go
104 lines
2.2 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package main
|
|
|
|
import (
|
|
"errors"
|
|
"html/template"
|
|
"io/ioutil"
|
|
"log"
|
|
"net/http"
|
|
"regexp"
|
|
)
|
|
|
|
type Page struct {
|
|
Title string
|
|
Body []byte
|
|
}
|
|
|
|
func (p *Page) save() error {
|
|
filename := p.Title + ".txt"
|
|
return ioutil.WriteFile(filename, p.Body, 0600)
|
|
}
|
|
|
|
func loadPage(title string) (*Page, error) {
|
|
filename := title + ".txt"
|
|
body, err := ioutil.ReadFile(filename)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &Page{Title: title, Body: body}, nil
|
|
}
|
|
|
|
func viewHandler(w http.ResponseWriter, r *http.Request) {
|
|
title, err := getTitle(w, r)
|
|
if err != nil {
|
|
return
|
|
}
|
|
p, err := loadPage(title)
|
|
if err != nil {
|
|
http.Redirect(w, r, "/edit/"+title, http.StatusFound)
|
|
return
|
|
}
|
|
renderTemplate(w, "view", p)
|
|
}
|
|
|
|
func editHandler(w http.ResponseWriter, r *http.Request) {
|
|
title, err := getTitle(w, r)
|
|
if err != nil {
|
|
return
|
|
}
|
|
p, err := loadPage(title)
|
|
if err != nil {
|
|
p = &Page{Title: title}
|
|
}
|
|
renderTemplate(w, "edit", p)
|
|
}
|
|
|
|
func saveHandler(w http.ResponseWriter, r *http.Request) {
|
|
title, err := getTitle(w, r)
|
|
if err != nil {
|
|
return
|
|
}
|
|
body := r.FormValue("body")
|
|
p := &Page{Title: title, Body: []byte(body)}
|
|
err = p.save()
|
|
if err != nil {
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
http.Redirect(w, r, "/view/"+title, http.StatusFound)
|
|
}
|
|
|
|
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
|
|
t, err := template.ParseFiles(tmpl + ".html")
|
|
if err != nil {
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
err = t.Execute(w, p)
|
|
if err != nil {
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
}
|
|
}
|
|
|
|
var validPath = regexp.MustCompile("^/(edit|save|view)/([a-zA-Z0-9]+)$")
|
|
|
|
func getTitle(w http.ResponseWriter, r *http.Request) (string, error) {
|
|
m := validPath.FindStringSubmatch(r.URL.Path)
|
|
if m == nil {
|
|
http.NotFound(w, r)
|
|
return "", errors.New("invalid Page Title")
|
|
}
|
|
return m[2], nil // The title is the second subexpression.
|
|
}
|
|
|
|
func main() {
|
|
http.HandleFunc("/view/", viewHandler)
|
|
http.HandleFunc("/edit/", editHandler)
|
|
http.HandleFunc("/save/", saveHandler)
|
|
log.Fatal(http.ListenAndServe(":8080", nil))
|
|
}
|